A powerful 6.3-magnitude earthquake struck off the southern Philippines early Saturday but there was no threat of a tsunami, US seismologists said.

The offshore quake hit at 6:53 am (2253 GMT Friday) and was centred around 100 kilometres (63 miles) southeast of the city of Davao on the island of Mindanao, according to the US Geological Survey. The Pacific Tsunami Warning Center said there was no tsunami threat from the strong quake.